Crank-connection



2 Sheets-Sheet 1.

-D. A. CAMERON.

CRANK CONNECTION. I No. 443,267. Patented Dec. 23,1890.

. (No Model -D. A g RON- CRANK ONL 2 Sheets- 2 Patented Dec. 23', 1890.

UNITED STATES PATENT EEicE.

DANIEL A. CAMERON, OF PITTSBURG, PENNSYLVANIA.

CRANK-CONNECTION.

SIECIFICATION forming part of Letters Patent No. 443,267, dated December 23, 1890.

Application filed March 31,1890. Serial No. 345.968. (N0 model.)

To all whom it may concern:

Be it known that I, DANIEL A. CAMERON, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Orank- Connections, of which the following is a full, clear, and exact description.

My invention consists in an improved connection between the crank and pitman of an oil-rig, by means of which the crank and pitman may be readily disconnected from each other when it is desired so to do. This has to be done continually. Heretofore the crank and pitman have been connected by means of a wrist-pin and a securing-collar on the pin outside of the pitman, the collar being kept in place by a key passing through a hole in the wrist-pin. The objection to this c011- struction has been the time and labor necessary to the separation of the pitman from the crank.

I will now describe my invention, so that others skilled in the art may make and use the same, reference being had to the accompanying drawings, forming part of this specification, in whicl M Figure 1 is a side elevation of an oil-rig, showing my improvement. Fi 2 is a partial side elevation of a pitman of an oil-rig, showing one form of my invention. Fig. 3 is a vertical longitudinal section on the line III III of Fig. 2. Fig. 4 is aside elevation of a modified form. Fig. 5 is a detail sectional view of Fig. A. Fig. 6 is a side View of another modification.

Like symbols of reference indicate like parts in each.

In the drawings, a represents the pitman. In the lower portion of this pitman is a slot 1) and follower c, which bears upon the wristpin d, and which connects the crank with the pitman. The follower is held in place by a wedge or key I). The crank is provided with several bearing-holes e for the wristpin, so that the speed and power may be changed at will. At one end of the wrist-pin cl, outside of the pitman, an annular groove f is formed, and pivoted to the face of the pitman is a latch g, having a recess 9, so that when the latch is lowered the annular groove in the wrist-pin shall be inclosed by the cut-away portion of the latch, thereby securing the wrist-pin in its place and connecting the crank and pitman. The outer end of the wrist-pin is also cut away or reduced in diameter, as shown at '5, so that in placing the wrist-pin in its position there will be no danger of a hammer-blow breaking the collar formed by the recess f on the wrist-pin d.

g is a pivoted keeper, adapted to bear on the latch to hold it in place on the wrist-pin.

In the drawings I have shown several forms of the latch g. Thus in Figs. 4 and 5 I show a latch having a longitudinal slot 9 through which its securing-bolt g passes, thus rendering the latch longitudinally adjustable and also pivotally movable on the axis of the bolt. The face of the latch at the sides of the slot is provided with locking-teeth, adapted to engage with teeth 011 a washer set on the inner side of the nut on the bolt, so as to hold the latch securely in its adjustment.

As shown in Figs. 2 and 4:, the notches g are at the lateral edges of the latches. In Fig. 0 I show the latch provided with a notch at its end, and in this form of my improvement the latch is slotted and is adjustably set on its retaining-bolt, so that by moving the latch longitudinally it may be freed from or caused to engage with the groove on the wrist-pin.

The operation is as follows: \Vhen it is desired to disconnect the pitman from the crank, the latch is lifted and the crank and pitman are then easily separated from each other, the pitman being pulled from the wristpin; yet, at the same time, while the pitman and crank are connected, the latch serves as a perfect guard against any accidental separation.

Although I have spoken of the latch as being pivoted, it is not necessarily so, as it may be secured by cleats or other devices.

hat- I claim, and desire to secure by Letters Patent, is-

1. The combination of a crank arm or crank and pitman with the pivoted latch, whereby the two are removably connected with each other, substantially as and for the purposes described.

3. The combination of aerank-arni or ernnk, In testimony whereof I have hereunto set a pitman, a- Wrist-pin connecting the crank my hand this 15th day of March, A. D. 1890. and )itman and havim a peri )herai roove 1 i 1 T and latch secured to i he pitn an ZLDQCIIIOVZLZ CAMEROL' 5 Die thereon into engagement with the groove Witnesses:

on the wrist-pin, substantially as and for the .TNO. K. SMITH, purposes described. R. H. \VHITTLESEY. 

